New cephem compounds processes for preparation thereof and pharmaceutical compositions containing them.

摘要

A compound of the formula : <CHEM> wherein R<1> is amino or a protected amino, R<2> is lower alkyl, carboxy (lower) alkyl, protected carboxy (lower alkyl or cycloalkyl, and R<3> is carboxy or a protected carboxy, and pharmaceutically acceptable salts thereof, processes for preparation thereof and pharmaceutical compositions containing them in association with a pharmaceutically acceptable, substantially non-toxic carrier or excipient.